1328904972 has 36 divisors (see below), whose sum is σ = 3360302400. Its totient is φ = 442819872.

The previous prime is 1328904959. The next prime is 1328904979. The reversal of 1328904972 is 2794098231.

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (1328904979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 177154 + ... + 184502.

Almost surely, 2^1328904972 is an apocalyptic number.

1328904972 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1328904972 is an abundant number, since it is smaller than the sum of its proper divisors (2031397428).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1328904972 is a wasteful number, since it uses less digits than its factorization.

1328904972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12382 (or 12377 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 45.

The square root of 1328904972 is about 36454.1488996794. The cubic root of 1328904972 is about 1099.4225542227.

The spelling of 1328904972 in words is "one billion, three hundred twenty-eight million, nine hundred four thousand, nine hundred seventy-two".